Siloxane composite-based light-weight optical lenses

US8318887B2 · kind B2 · utility

Assignee

• KOITO MANUFACTURING CO., LTD. · JP

Inventors

• Ertugrul Arpac · Antalya, TR
• Savas Guven · Antalya, TR
• Carsten Schmidt · Jena, DE
• Helmut Schmidt · Riegelsberg, DE
• Daisuke Mochizuki · Chiba, JP
• Kazuhito Osada · Shizuoka, JP

Key dates

• Filing date: Mar 19, 2009
• Grant date: Nov 27, 2012
• Expiry date: Mar 19, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/70
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Disclosed is a process of preparing a moulded article, comprising 1) hydrolyzing a) at least one silane having one non-hydrolysable organic group, and b) at least one compound selected from b1) a silane having two non-hydrolysable organic groups, and b2) a hydrolysable polysiloxane, or a mixture thereof, and c) optionally at least one silane having no non-hydrolysable organic group, to prepare a composite composition comprising a hydrolysate or condensate, 2) placing the composite composition in a mould, 3) curing the composite composition to increase the degree of condensation, 4) removing the moulded article from the mould, and 5) heat treating the moulded article at a temperature of at least 100° C. The moulded article is preferably an optical lens which may be used for automobile headlights.